Frequency selection surface structure based on multilayer annular slit pasters

Abstract

The invention discloses a frequency selection surface structure based on multilayer annular slit pasters. The frequency selection surface structure is composed of N*M resonance units. The resonance units comprise two medium substrates in parallel arrangement, the upper surface and the lower surface of each medium substrate are each provided with an annular slit paster, and the structure of each annular slit paster is specifically formed in such a way that rectangular slits are respectively arranged at the center points of four edges of an inner ring of an FSS annular paster, the rectangular slits being symmetrical about the edge center points of the inner ring. According to the invention, four annular slit pasters are employed, cascading of a multi-stage band-stop filter is realized, the band-stop performance is better, and the bandwidth is wider.

Description

technical field [0001] The invention relates to a spatial filter, in particular to a frequency selective surface structure based on a multi-layer annular slot patch. Background technique [0002] Frequency selective surface (FSS) is a two-dimensional periodic array structure composed of periodically arranged metal patch units or periodic opening units on a metal screen, which can be used as a spatial filter. Interaction with electromagnetic waves exhibits band-pass or band-stop characteristics. Frequency selective surfaces have a wide range of applications in many aspects of the electromagnetic field, covering most of the electromagnetic spectrum, including microwave, millimeter wave, and even infrared bands. In terms of military use, FSS is mainly used in stealth aspects, such as radomes, which reduce the radar scattering cross-section by installing frequency selective surfaces. The stealth performance of military aircraft has become an important indicator to measure its ...

AI Technical Summary

Problems solved by technology

At present, FSS mainly includes circular, circular, cross-shaped, rectangular patches, etc., which mainly realize the complete reflection of electromagnetic waves at resonant frequencies. Due to the simple shape of these basic units, their control parameters are relatively small, which cannot well meet actual requirements, such as , narrow bandwidth, small slope of the frequency response curve, poor stability, etc. Although the method of loading capacitance and increasing the electrical length can be used to realize the double stopband frequency selection surface and meet the requirements of multi-frequency broadband, this method increases the complexity of the structure

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